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Contacteur membranaire innovant pour la cristallisation : application aux systèmes de type diffusion / réaction

Abstract : Membrane processes are considered as one of the most promising breakthrough technology for crystallization/precipitation operations. Porous materials have been extensively investigated but they have shown some serious limitations due to pore blocking and wetting phenomenon. The use of a dense membrane is expected to circumvent the pore blocking issue while keeping the advantages of membrane processes. In a first part, the model compound, BaCO3, is precipitated within a gas-liquid or liquid-liquid membrane contactor working under static conditions for both systems. In this configuration, hydrodynamic influences are avoided. The membrane-crystals interactions are studied using several dense membrane polymers. Permeability of both reactant species and surface tension are the key parameters to be considered. Indeed, these parameters greatly affect the deposit location of the crystals and their adherence on the membrane surface. Fouling within the membrane and on the surface are prevented with PDMS and Teflon AF 2400 which are thereby the two most promising materials for the given application. In a second part, the same model compound is precipitated in gas-liquid system under dynamic conditions. Self-supporting (PDMS) and composite hollow fibers (PP-Teflon AF 2400) are studied. Investigations on the operating condition influences show similar results to those obtained with membrane contactor used for CO2 capture: resistance to mass transfer is mainly located in the liquid phase. Proof of concept is supported by the stable performances obtained with the PP-Teflon AF 2400 module of 10 % packing ratio. The module geometry, and more specifically its packing ratio, is an important criterion to take into account to avoid module blocking. Finally, 2D computational fluid dynamics simulations, using the finite element method are performed. One single kinetic parameter is used to fit the experimental data. The simulated concentration profiles are not satisfactory. Nonetheless, predictability of the model seems to be promising: crystal productivities are rather well estimated
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Submitted on : Tuesday, March 31, 2020 - 9:14:09 AM
Last modification on : Wednesday, April 1, 2020 - 1:50:54 AM

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  • HAL Id : tel-02520497, version 2

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Maïté Michaud. Contacteur membranaire innovant pour la cristallisation : application aux systèmes de type diffusion / réaction. Génie des procédés. Université de Lyon, 2019. Français. ⟨NNT : 2019LYSE1322⟩. ⟨tel-02520497v2⟩

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